Ahhhh... I just found that Amazon sells what looks to be the correct design for the right side mount!
They are made by an aftermarket company called Westar.
I'm going to order just the Right side, and keep the left side (DEA brand) that I already bought. The DEA mount was much cheaper (1/2 price).
The distributor for Amazon has 20 of them in stock.
I just tried searching for other sources for this Westar mount... there are none! Looks like they have the last batch.

BTW...
Here are the part numbers

Isuzu OEM:
Left Motor Mount:
8971041581
Right Motor Mount:
8971041571

(Aftermarket) Westar Motor Mounts:
Left
1028AMZ1935
Right
1028AMZ1934

Man... I hope this helps the next person... This was a PITA!
LOL